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In mathematics , the Siegel upper half-space of degree g (or genus g ) (also called the Siegel upper half **plane** ) is the set of g × g symmetric matrices over the complex numbers whose imaginary part is positive definite . It is named in honor of Carl Ludwig Siegel . In the case

**wikipedia.org** | 2011/5/19 1:59:12

An omnidirectional antenna is an antenna which radiates power uniformly in all directions in one **plane** , with the radiated power decreasing with elevation angle above or below the **plane** , dropping to zero on the antenna's axis. This radiation pattern is often described as "donut shaped"

The Dedekind eta function , named after Richard Dedekind , is a function defined on the upper half **plane** of complex numbers , where the imaginary part is positive. For any such complex number , we define , and define the eta function by (The notation is now standard in number theory

named for its shape by Frank Debenham of British Antarctic Expedition , 1910–13, who made a **plane** table survey of the peninsula in 1912. This article incorporates public domain material from the United States Geological Survey document "Half Moon Crater" (content from the Geographic

**wikipedia.org** | 2011/7/17 21:11:45

Moon, causing a lunar eclipse . Solar and lunar eclipses are not observed every month because the **plane** of the Moon's orbit around the Earth is tilted by about five degrees with respect to the **plane** of Earth's orbit around the Sun (the **plane** of the ecliptic ). Thus, when new and full moons

In mathematics , the complex **plane** or z **plane** is a geometric representation of the complex numbers established by the real axis and the orthogonal imaginary axis . It can be thought of as a modified Cartesian **plane** , with the real part of a complex number represented by a displacement

**wikipedia.org** | 2011/6/29 19:01:03

A dipole antenna is a radio antenna that can be made of a simple wire , with a center-fed driven element . It consists of two metal conductors of rod or wire, oriented parallel and collinear with each other (in line with each other), with a small space between them. The radio frequency

The Möbius strip or Möbius band (pronounced UK: /ˈmɜːbiəs/ or US: /ˈmoʊbiəs/ in English, [ˈmøːbi̯ʊs] in German) (alternatively written Mobius or Moebius in English) is a surface with only one side and only one boundary component . The Möbius strip has the mathematical

intersecting lines 2 Triangles 3 Circles, spheres and balls 4 History 5 Models of the hyperbolic **plane** 5.1 Connection between the models 6 Visualizing hyperbolic geometry 7 Homogeneous structure 8 See also 9 Notes 10 References 11 External links [ edit ] Non

A wallpaper group (or **plane** symmetry group or **plane** crystallographic group ) is a mathematical classification of a two-dimensional repetitive pattern, based on the symmetries in the pattern. Such patterns occur frequently in architecture and decorative art . There are 17 possible distinct